Boring-bar.



PATENTED MAY 8, 1906. S. & P. P. DYER.

BORING BAR.

APPLICATION FILED NOV.11,1904.

2 SHEETSSH'EET 1.

No. 819,743. PATENTED MAY 8, 1906. S. & P. P. DYER.

BORING BAR.

APPLICATION FILED NOV. 11,1904.

- 2 SHBBT8-SHEET 2.

nwentoz r r 45129877 UNITED STATES PATENT OFFICE.

SAMUEL DYER AND FRANK PHDYER OF MUNCIE, INDIANA.

BORING-BAR.

Specification of Letters Patent.

Patented May 8, 1906.

Application filed November 11,1904. Serial No. 232,315.

' ing-bar and the sleeves carried by said bar ar being in sectlon. Fig. 8 1s a section on and in turn carrying the cutters and an improved lever for adjusting the bar.

Heretofore boring-tools have been supported by being set in a tool-post and fastened or clamped at one end only, the tool projecting a foot or more, with the result that when the tool would strike a ridge or hard spot it would spring away, rendering it difiicult to get an accurate bore. I

The object of our invention is to support the bar at each end either concentrically or eccentrically, to provide means for sliding the cutter along said bar, to provide means whereby the cutter can be brought to and from the work at will, and also to provide a plurality of interchangeable parts, so that all classes of work can be done, the same guid ing-bar being used for the various cutters and sleeves.

Our invention consists in the novel features of construction and combination of parts hereinafter described, particularly pointed out in the claims, and shown in the accompanying drawings, in which Figure 1 is a perspective view of our boring-bar in position for use applied thereto. Fig. 2 is a plan view of a sleeve and cutterhead. Fig. 3 is an end view of the cutterhead shown in Fig. 2. elevation, showing the cutter-head end portion of the sleeve, the head being removed. Fig. 5 is a longitudinal section through a sleeve, the lever being also shown in section and the bar being shown partly in section and partly in elevation. Fig. 6 is an end view of the bar, showing the lever and sleeve tail or shank. Fig. 7 is a detail view of the sleeve and cutter-head shown in section in Fig. 5, the central portion of the sleeve being broken away, the head and frontend being in lan, and the rear end, shank, and lever-colthe line 8 8 of Fig. 7, illustrating the phsition fStOOk, having a dead-center.

splined, as at C, for about one-half its length, the spline extending to the rear end of the Fig. 4 is a view in side I of the cutter-head with reference to the artile operated on, the latter being shown. in

otted lines. i cutter-head for use in bores of a larger size. than those with which the other cutter-heads are used; and Fig. 10 is an end view of the. cutter-head shown in Fig. 9, showing same in. position, the bar being shown in cross-secltion.

In the drawings, Arepresents a lathe-chuck having the usual live-center, and B the tail The rest A is moved along the guide-rails A by any desired mechanism. These, it will be under-. stood, are of the usual construction.

The main essential part of our invention is the solid cylindrical bar C. This bar is.

bar. At each end of this bar two sockets are formed, the sockets C being on the true axial center of the bar and the sockets C being. eccentric. Arranged on the rest A is an an gled plate D, having both its horizontal and vertical members longitudinally slotted and secured to the rest by a suitable bolt and nut, the bolt passing through the slot in the horizontal member of the plate.

In Fi 2 we have shown asleeveE, which is' adapted to slide loosely on the bar C. This sleeve is reduced and threaded at its forward. end, as at E, and a cutter-head E is adapted. to be threaded on the reduced end of the sleeve. A tail-shank E is formed integral. with the sleeve adjacent the rear end and is adapted to engage the slot in the vertical member of the angled plate D.

In Fig. 5 we have shown the sleeve F fitting loosely on the bar C. This sleeve has formed integrally at its forward end an eccentric cutter-head F having in its eccentric portion a diagonally-arranged slot, in which is adjust.- ably held the cutting-tool F. This cutting. tool is sharpened at one end, and whentheizr sleeve is in the position shown in Fig. 5}.tl16lq cutting-tool is downwardly and rearwardly; inclined with respect to the bar C. The cuts.

ting-tool is held in its adjusted position by root,

the countersunk screws F. At 1ts rear end}. the sleeve F is threaded, and a lever F is i formed integral with a collar F, which is partially threaded to fit over the threaded Fig. 9 is a perspective view of jacent the rear end the sleeve F has formed on it a laterallyextending shank F similar in general construction and purpose to the shank E The shank F however, carrles a perforated lug G, and the lever F has formed on its forward side a perforated lug G, and a segmental screw G smooth on its upper and under faces and threaded on the sides, has

one end secured in the lug G and works through the lug G, a head G at the free end of the segment preventing its being withdrawn from engagement with the lug G, and a circular milled nut G, working on the segment between the two lugs, can be adjusted to vary the throw of the lever F. A suitable clamping-screw F works through one side of the collar and bears upon the sleeve F,

'so that the collar and lever may be held against movement relative to the sleeve.

When a large bore is to be cut, the cuttingtool F is removed and a split band H is slipped over the eccentric head F The band H carries a feather H, adapted to fit in a spline H formed on the under side of the head F whereby rotation of the-band on the eccentric head is prevented. The band has a lateral rojection H This projection is longitu inally slotted, and the band is also apertured on the opposite side in alinement with the slot in the projection H When the band is in place on the eccentrically-arranged head F", the slots in the band aline with that in the head, and a cutting-tool H is arranged therein. The projection H forms a long substantial bearing for the cutter end of the tool and enables it to extend a considerable distance beyond the band without danger of its becoming bent or s rung for lack of a suitable support. We ave now described in detail the separate parts of our invention and will describe their operation on two different classes of work, so as to make clear the purpose of the constructions set forth.

Where a number of pulleys or gears are to be bored to a given size, especially by inexperienced hands, the sleeve E is used with the cutter-head E of the proper size. The sleeve is slipped on the bar 0, the bar projecting at both ends. The forward end of the bar is passed through the rough bore of the pulley or gear in which the bore is to be finished and the forward end of the bar is placed in the live-center of the rail, using the true center or socket C of the bar. The rear end of the bar is fixed in the dead or tailstock center. The bar C is now suspended by its true center on the centers of the lathe. The shank E is placed in engagement with the slot of the vertical member of the plate D, the lathe started, and the cutter-head fed to the work by movement of the rest-block imparting corresponding movement of the sleeve along the bar 0, the shank and the angled plate forming the connection between the sleeve and the rest-block. The diameter of the cutter-head or mill determines the size of the bore, and the sleeve is accurately guided to the work by the bar C. As the sleeve and cutter-head fit this bar snugly, though not tight enough to cause undue friction, there is no opfp ortunity for the cutter to spring or to vary om the desired diameter. The sleeve F and cutter]? may be used to bore a hole of any size, cut internal threads, chambers, form interior grooves and sockets, and other work of like character. When this sleeve is used, the bar is suspended on its eccentric sockets C The sleeve F is laced in position, and the roper head or the desired work is used. it is obvious that movement of the lever in either direction causes rotation of the bar, as it is keyed to the lever-collar, It will be further noted that as the bar is eccentrically mounted movement of the lever in one direction, and consequent rotation of the eccentrically-sus ended rod, will throw the point of the cutting-tool farther toward or into the work, and opposite movement of the lever will draw the point away from the work, such movements of the tool being transverse movements as distinguished from the longitudinal movement imparted by the rest-block. It is thus obvious that the lever F can be set to feed the tool according to the requirements of the special work on hand. As the least movement of this lever will cause a change in the position of the tool with reference to the article being operated on, the lever may be locked against accidental movement by means of the clamping screw F and its movement also regulated by adjusting the nut G.

It will be obvious from'the above that we have a lathe attachment adapted for use in a wide range of work and capable of quick and accurate adjustment to meet the demands that may be made on it where irregular boring is required.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. A device of the kind described comprising a bar, a sleeve adapted to slide on the bar, an eccentric cutter-head carried by the sleeve and diagonally slotted, a split band, means for clamping the band adapted to be clamped on said cutter-head, said band having a longitudinally-slotted projection and apertured in alinement with the slot in the pro-' jection said aperture and slot being adapted to aline with the slot of the cutter-head," a

cutting-tool held in said'slots, means for rotion of the sleeve, said collar being slidably 1o tating the bar With reference to the sleeve, keyed to the bar, and a handle carried by the and means for moving the sleeve. collar.

2. A device of the kind described comprising a boring-bar, having end sockets, a sleeve fitting loosely on the bar and exteriorly threaded at one end, a cutter-head carl/Vitnesses: ried by the opposite end of the sleeve, a col- KATHERINE P. DYER,

lar partially threaded t0 fit the threaded por- FREDERICK F. MoOLELLAN. 

